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Studio UX iteration — UX-08 viewport error recovery

Date: 2026-05-25
Branch: feat/studio-gap-close-wave1
Scope: packages/li-studio/

Summary

Viewport GPU / missing-asset recovery overlay in Li compose + paint IR with honest runtime mock (no wgpu surface failure detection).

UX scores

ID Score Note
UX-08 2.8 GPU + missing-asset kinds, message + retry stroke rects, retry clears mock; native wgpu probe still gap (Primer = 3).

Evidence

  • packages/li-studio/src/lib.li — StudioViewportErrorOverlay, studio_paint_viewport_error, shell chrome branches error before empty/scene.
  • runtime/li_rt.c — g_studio_viewport_error_kind mock.
  • packages/li-studio/li-tests/smoke/studio_viewport_error.li — gpu overlay cmds + retry clears.

Native gap (honest)

Li IR does not call wgpu surface_ok or asset loaders; hosts set li_rt_studio_viewport_error_set_mock until render bridge reports real failures.